Protection
This class can control how many times ads are shown to a user over 24hours.
More Info 
Developer: lee johnstone
License: Free for non-commercial use
Operating System: all
Easily add password protection to an entire website supporting Active Server Pages.
Developer: http://www.powerasp.com/...
License: Freeware
Operating System: Win NT
Scott brady's Passeord Protection is a multi-platform compatible script that lets you password protect your page.
Developer: tachi
License: Freeware
Operating System: All
Cookie Protection is a multi-platform compatible script that works by limiting users who don’t have cookies from accessing certain parts of your site.
Developer: tachi
License: Freeware
Operating System: All
Php captcha for spam protection with refresh functionality.
Developer: Sanjoy Ganguly
License: GNU General Public License (GPL)
Operating System: UNIX, Win NT, XP,
Guestbook with complete spam protection, similes, counter, Power full admin panel, database backup.
Developer: softacme.com
License: MIT/X Consortium License
Operating System: ALL
Locked Area Lite is a highly sophisticated password protection and membership/user management system written in Perl.
Developer: locked-area.com
License: Freeware
Operating System: Unix, Linux, Windows, Sun Solaris
Chico Digital Md5 Secure Encrypted Login multi-platform compatible.
Developer: http://perl-md5-login.so...
License: Freeware
Operating System: Unix/Linux/Windows
Ioncube Standalone Php Encoder is a multi-platform compatible script that offers superior script protection by eliminating source and encoding compiled code.
Developer: http://www.ioncube.com/e...
License: Freeware
Operating System: All
Access Protect is a multi-platform compatible.
Developer: AccessProtect
License: Freeware
Operating System: All
Free guestbook with spam protection for your webpage.
Developer: anvilbook.com
License: Freeware
Operating System: All
Free script to protect products sold on ClickBank.
Developer: Brian Vogt
License: Freeware
Operating System: PHP/Linux/Apache
Flexible user management and password protection.
Developer: Jamie
License: Freeware
Operating System: PHP
Apache's.
Developer: The Mouse Whisperer
License: Freeware
Operating System: All
A web based mailing list management script that supports email validation, address pin verification and the ability to subscribe and unsubscribe at any time.
Developer: http://mojo.skazat.com/
License: Freeware
Operating System: All
eAuction allows everyone to set up a powerful and multilingual online auction site.
Developer: Dieter Werner
License: Freeware
Operating System: Linux / Win
Easy to install and use, no database required.
Developer: Patrik Jakab
License: GNU General Public License (GPL)
Operating System: All
Easily create, build and generate forms that send emails with an online form wizard interface.
Developer: Alex Marias
License: GNU General Public License (GPL)
Operating System: Win
ASPired2Encode is a CAPTCHA system for adding anti spam protection to your forms.
Developer: The Net Guys
License: Freeware
Operating System: Windows
User authorisation script and password protection for your Frontpage based website.
Developer: JetStat.com
License: Freeware
Operating System: Windows